(i75) 



Astragalus debilis (Nutt.) A. Gray. Fort Selkirk (Tarle- 

 ton). 



Astragalus alpinus L. Near mouth of Klondike (Wil- 

 liams) ; White Horse Rapids (Tarleton). 



Astragalus Williamsii Rydb. sp. now 



Stem ascending or erect, 2-4 dm. high, more or less dis- 

 tinctly 4-angled, perfectly glabrous, light green or in age 

 straw-colored ; stipules ovate to narrowly lanceolate, 3-6 mm. 

 long, free ; leaves longer than the internodes, 5-10 cm. long ; 

 leaflets 9-1 1, elliptical to almost linear, 15-35 mm. long, 4-8 

 mm. wide, obtuse or retuse at the apex, perfectly glabrous ; 

 raceme at first short, in fruit elongating and about 1 dm. 

 long, borne on a peduncle 1— 1.5 dm. long ; bracts oblong, ob- 

 tuse, membranous, straw-colored, about 3 mm. long ; pedicels 

 short, 1-2 mm. long; calyx about 3 mm. long, black-hairy; 

 lobes less than 1 mm. long, triangular obtuse ; corolla yellow, 

 except the purplish tip of the keel ; banner about 1 cm. long, 

 narrow, keel about 8 mm. ; pod ascending, half membranous, 

 oblong-ovate in outline, 10-14 mm. long and 4 mm. wide, 

 glabrous, rounded at the base, acute at the apex; dorsal 

 suture deeply sulcate for about two-thirds of its length and 

 with a narrow partial partition, making the pod there deeply 

 obcordate in section ; the upper third not sulcate and with no 

 indication of a partition ; seeds about 4, brownish black. 



A species perhaps referable to the Oroboidcs, but without 

 any close relative in that group. Its small yellow flowers 

 and peculiar fruit are characteristic. 



The type was collected by R. S. Williams, near Big 

 Salmon, August 22, 1899. 



Astragalus Tarletonis Rydb. 



Stem ascending, about 2 dm. high, angled, striate and 

 sparingly strigulose : stipules lanceolate, attenuate, sparingly 

 strigose, free from the petiole but somewhat united around 

 the back of the stem : leaves about 1 dm. long, spreading ; 

 leaflets 17-29, elliptic to lanceolate, oblong, 10-15 mm. long, 

 3-6 mm. wide, sparingly strigose or in age glabrate, obtuse 

 or retuse at the apex: spikes short and crowded, 3-4 1 

 long on peduncles about 1 dm. in length : bracts oblong, 6-8 

 mm. long, mostly obtuse and black-hairy: calyx black- 

 hairv; its tube about 6 mm. long; lobes linear subuli 



